MAINT: update oldest supported GCC version from 8.4 to 9.3 #28102
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This hasn't been updated in quite a while, and 8.4 just ran into another SIMD-related bug in #28030. Other considerations:
xref https://scipy.github.io/devdocs/dev/toolchain.html#compilers and https://github.com/mayeut/pep600_compliance for relevant pages to track compiler and distro versions.